不同煤级区煤层气可动性和初始排水速度控制策略

doi:10.7623/syxb201810008

石油学报 ›› 2018, Vol. 39 ›› Issue (10): 1162-1174.DOI: 10.7623/syxb201810008

不同煤级区煤层气可动性和初始排水速度控制策略

康永尚^1,2, 李喆^1,3, 王金¹, 孙良忠¹, 毛得雷^4,5, 孙晗森^6,7, 顾骄杨^6,7

1. 中国石油大学地球科学学院北京 102249;
2. 油气资源与探测国家重点实验室北京 102249;
3. 北京石油化工学院北京 102617;
4. 煤层气开发利用国家工程研究中心北京 100095;
5. 中联煤层气国家工程研究中心有限责任公司北京 100095;
6. 中海石油(中国)有限公司非常规油气分公司北京 100015;
7. 中联煤层气有限责任公司北京 100015

收稿日期:2018-02-02 修回日期:2018-08-17 出版日期:2018-10-25 发布日期:2018-12-05
通讯作者: 康永尚,男,1964年11月生,1984年获中国矿业学院学士学位,1991年获法国洛林理工学院博士学位,现为中国石油大学(北京)教授,主要从事非常规油气勘探开发地质工程及海外油气项目储量、价值评估研究和教学工作。Email:kangysh@sina.com
作者简介:康永尚,男,1964年11月生,1984年获中国矿业学院学士学位,1991年获法国洛林理工学院博士学位,现为中国石油大学(北京)教授,主要从事非常规油气勘探开发地质工程及海外油气项目储量、价值评估研究和教学工作。Email:kangysh@sina.com
基金资助:
国家科技重大专项"滇东黔西煤层气开发技术及先导性试验"（2016ZX05044）资助。

Coalbed methane mobility and primary drainage rate control strategy in different coal-rank blocks

Kang Yongshang^1,2, Li Zhe^1,3, Wang Jin¹, Sun Liangzhong¹, Mao Delei^4,5, Sun Hansen^6,7, Gu Jiaoyang^6,7

1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
3. Beijing Institute of Petroleum Technology, Beijing 102617, China;
4. National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing 100095, China;
5. National Engineering Research Center of China United Coalbed Methane, Beijing 100095, China;
6. Unconventional Oil & Gas Branch, CNOOC China Limited, Beijing 100015, China;
7. China United Coalbed Methane Corp. Ltd., Beijing 100015, China

Received:2018-02-02 Revised:2018-08-17 Online:2018-10-25 Published:2018-12-05

摘要/Abstract

摘要：

对中国20个区块/煤矿煤层气地质参数进行了系统整理，开展了煤层气吸附时间和渗透率随煤级变化规律分析，并结合不同煤级区煤层气井的产气曲线，揭示了峰值产量出现前后不同煤级区产气动态差异的原因，以期为不同煤级区初始排水速度控制提供依据。研究结果表明：①吸附时间随煤级升高呈"U"型变化规律，中、低煤级区煤岩吸附时间一般低于15 d，高煤级区吸附时间变化大，吸附时间在0.1~85.54 d变化；②区块/煤矿间煤储层渗透率随煤级升高没有明显的规律性变化，同一区块内部，渗透率变化级差达2~3个数量级；③峰值产量出现时间与初始排水速度和煤岩吸附时间有较好的对应关系，而与渗透率的关系不明显；④在不同煤级区，针对不同井层煤储层吸附时间与渗透率的配置关系，应采用针对性初始排水速度控制策略：中、低煤级区煤岩吸附时间短，对低渗透井层应严格控制初始排水速度；高煤级区吸附时间变化区间大，对吸附时间长、渗透率高的井层，可适当加快初始排水速度。

关键词: 煤级, 可动性, 吸附时间, 渗透率, 峰值产量, 初始排水速度

Abstract:

The coalbed methane geological parameters of 20 blocks/mines in China are systematically collected and sorted to analyze the change laws of sorption time and permeability varying with coal-rank. In combination with the gas production curves of CBM wells in different rank blocks, this study reveals the reasons for gas production dynamic diversity in different rank blocks prior and posterior to peak production, in order to provide the basis for controlling primary drainage rate in different rank blocks. The studies show that (1) sorption time has a U-shaped variation with the increasing coal-rank. In the low and medium rank blocks/mines, the sorption time is generally less than 15 d; in high rank blocks/mines, the sorption time greatly varies from 0.1 to 85.54 d. (2) Coal reservoir permeability has not varied systemically with the increasing coal-rank between the blocks/mines, but shows 2-3 orders of difference within a block/mine. (3)Peak production time is correspondingly related to primary drainage rate and sorption time, but not evidently related to permeability. (4) In different rank blocks, the primary drainage rate of a well should be controlled according to the allocation relation between sorption time and permeability of coal seams in the well:in low and medium rank blocks, the sorption time is generally short, for the well/seam with low permeability, the primary drainage rate has to be strictly controlled. In high rank blocks, the sorption time varies from short to long, for the well/seam with long sorption time and high permeability, the primary drainage rate can be speeded up appropriately.

Key words: coal-rank, mobility, sorption time, permeability, peak production, primary drainage rate

中图分类号:

TE349

康永尚, 李喆, 王金, 孙良忠, 毛得雷, 孙晗森, 顾骄杨. 不同煤级区煤层气可动性和初始排水速度控制策略[J]. 石油学报, 2018, 39(10): 1162-1174.

Kang Yongshang, Li Zhe, Wang Jin, Sun Liangzhong, Mao Delei, Sun Hansen, Gu Jiaoyang. Coalbed methane mobility and primary drainage rate control strategy in different coal-rank blocks[J]. Acta Petrolei Sinica, 2018, 39(10): 1162-1174.

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不同煤级区煤层气可动性和初始排水速度控制策略

Coalbed methane mobility and primary drainage rate control strategy in different coal-rank blocks

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